Benjamin f



(No Model.) I

B, F. BARNES.

FEED DEVICE FOR DRILLING MAGHINES.

No 379,194. Patenfied Mar. 6, 1888.

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N PETERS, Phmo Lilmgqgher, Washingtom D. C.

ATENT OFFICE.

BENJAMIN F. BARNES, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THE WV. F. & JOHNBARNES COMPANY, OF SAME PLACE.

FEED DEVICE FOR DRILLING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 379,194, dated March 6,1888.

Application filed October 4, 1887. Serial No. 251,412.

To (ZZZ whom it may concern.-

Be it known that I, BENJAMIN F. BARNES, a citizen of the United States,residing at the city of Rockford, county of Winnebago, and

v State of Illinois,have invented certain new and useful Improvements inDrilling-Machines, of which the following is a specification.

This invention relates to that portion of a drilling-machine known asthe feed mechro anism, in which is employed a lever, in combination witha hand-wheel, to operate the feeding mechanism of the drill.

The object of this invention is to provide an improved feed mechanismfor drilling machines; and my'invention consists in a combinedgear-wheel and lever-ratchet feeding mechanism capable of use as ascrewgear feed or as a lever-ratchet feed independently,which device isrepresented in the accompanying drawings, in which Figure l is a sideelevation of an apparatus embodying my invention. Fig. 2 is a rearelevation of the same. Fig. 3 is a vertical cen tral section on dottedline a on Fig. 2, show- 2 ing the connections of the various parts.

The apparatus represented in the drawings is an improvement on PatentNo. 270, 53?,dated January 9, 1883, issued to John and Benjamin F.Barnes, and is capable of use on the drill represented in said patent,and in this application I deem it only necessary to describe and showthe construction of my improved feed mechanism.

In the construction shown in the patent above referred to the supportfor the shaft which carried the screw-pinion was pivoted to thehandlever, so that when it was desired to free the screw-pinion from thegear-wheel it was necessary to lift it in a curved path,whereby when itwas again lowered into engagement with the gear-wheel the severalthreads were not simultaneously lowered into engagement, but first theone nearer the pivot and then the others in succession, which was liableby the catching or failure to register of the first one to cause delayin getting the new and firm grip desired, while the pivoting of the saidscrew-pinion supporting-frame required an unnecessary number of partsand undue frictional wear of the device as a lever-ratchet (No model.)

mechanism. My present construction does away with said pivoting of thescrew-support, reduces the number of parts to a minimum,and enables meto slide the screw-pinion directly toward or away from the periphery ofthe 5 gear-wheel, insuring the engagement of the several screw-threadswith the gear-teeth simultaneously, thereby affording a firm gripbetween the two, and theyare not liable to slip or cause delay.

A hand-lever, 1, is made in handle form at one end and its opposite endis made in yoke form, composed of yoke-arms 2, bored transversely attheir free ends to serve as bearings to the end portion of a shaft, 3,on which the 6 lever is mounted to oscillate and which is designed toconnect with the operating meohanism of the drill. A gear-wheel, 4, issecured to the shaft 3 within the arms 2 of the lever to rotatetherewith. Side openings, 5, areformed 7c in the yoke-arms of the lever,for a purpose to appear hereinafter. The yoke-end portion of the leveris tubular, the end portion 6 of which is of enlarged diameter, bored,for a purpose to appear hereinafter. 7

A yoke-bearing, consisting of a shank, 7, to enter the enlarged bore 6of the lever, and yoke-arms 8, to enter within the yoke-arms 2 of thelever, is put in place therein, and is capable of an endwise slidingmovement within 80 the arms 2 of the lever, which, in connection withthe enlarged bore 6, serve as guides to the endwise movements of theyoke-bearing.

The free ends of the yoke-arms 8 are boredtransversely andform thebearings to the end 8 portion of a screw-supporting shaft, 9, supportedto revolve therein. A screw, 10, to engage the teeth of the gear-wheel4, is fixed to the shaft 9 within the arms 8 of the yokebearing andwithin the side openings, 5, of 0 the yoke-arms 2 of the lever. V

A hand-wheel, 11, is fixed on the projecting outer end of thescrew-supporting shaft 9, for the purpose of rotating its shaft and thescrew fixed thereon to impart a rotary movement to 5 the gear-wheel 4,with which it engages.

A connecting-rod, 12, extending from its connection with theyoke-bearing in the axial center of the lever, has a pivotal connectionof its end with a thumb-lever, 13, pivoted at r00 one end to the leverin such a manner that a movement of its free handle end will impart asliding movement to the yOkebearing.

A spring, 14, surrounds the rod 12 within the tubular portion of thelever between the shank 7 of the yoke-bearing and a guide, 15, to therod 12 within the tubular portion of the lever, and operates to hold thescrew in working contact with the gear-wheel, from which it can bedisengaged by the inward movement of the free arms of the thumb-lever.

It will be seen that the action of the spring pressing on theyoke-bearing tends to hold the screw in working contact with thegear-wheel, and when the screw is rotated in either direction by meansof the hand-wheel a rotary motion will be imparted to the gear-wheel andthrough its shaft to operate the feed mechanism of the drill with whichit is connected; or the gear-wheel may be rotated in either direction tooperate the feed mechanism by an oscillatory movement of thelever,inwhich movement the screw engages the teeth of the gearwheel to serve thepurpose of a pawl, and by means of the thumb-lever the screw can bedisengaged from the gear-wheel to permit the return movement of thelever to again engage the gear-wheel, or to employ a quick returnmovement.

I claim as my invention 1. In a feed-operating mechanism, thecombination of a gear-wheel, a screw mounted in a bearing slidable in aright line toward and away from the gear-wheel, and a spring for holdingthescrew in engagement with the gearwheel, substantially as set forth.

2. In a feed-operating mechanism, the combination of a handlever, agear-wheel mounted in said lever, a bearing slidable in longitudinalparallel ways, a screw supported in said bearings, and means for slidingthe bearings, and hence the screw, away from and toward the gear-wheel,substantially as set forth.

3. In a feed-operating mechanism, the combination of the hand-lever, agear-wheel mounted in said lever, a bearing slidable in longitudinalparallel ways, a screw supported in said bearing, and a thumb-leverconnected with the bearing for disengaging the screw from thegear-wheel, substantially as set forth.

4. In a feed-operating mechanism, the combination of a hand-lever, agear-wheel mounted in said lever, a bearing slidable in longitudinalparallel ways, a screw supported in said bearings, a spring for holdingsaid screw in engagement with said gear-wheel, and a rod connecting theslidable bearing with the thumblever for disengaging the screw from thegearwheel, substantially as set forth.

5. In a feed-operating mechanism, the combination of a pivotalhand-lever, a gear-wheel mounted in said lever, a screw-bearingslidablein longitudinal parallel ways, a screw mounted in the said bearing,means for sliding the bearing, and hence the screw, toward and away fromthe gear-wheel, and a hand-wheel to rotate the screw, substantially asset forth.

BENJAMIN F. BARNES.

Witnesses:

A. O. BEHEL, J AOOB BEHEL.

